Moiré interferometry for thermal expansion of composites

1981 ◽  
Vol 21 (12) ◽  
pp. 441-447 ◽  
Author(s):  
D. E. Bowles ◽  
D. Post ◽  
C. T. Herakovich ◽  
D. R. Tenney
Keyword(s):  
Thermal Expansion ◽  
Moiré Interferometry ◽  
Moire Interferometry

Thermal Strain Measurements of Solder Joints in Second Level Interconnections Using Moire Interferometry

1992 ◽  
Vol 114 (1) ◽  
pp. 88-92 ◽  
Author(s):  
Yifan Guo ◽  
Charles G. Woychik
Keyword(s):  
Thermal Expansion ◽  
Solder Joints ◽  
Coefficient Of Thermal Expansion ◽  
Low Cycle Fatigue ◽  
Thermal Strain ◽  
Moiré Interferometry ◽  
Moire Interferometry ◽  
Mechanical Reliability ◽  
Surface Mount ◽  
Inherent Strength

Low cycle fatigue of solder joints is one of the major kinds of failures in second level interconnections of an electronic package. The fatigue failure is caused by thermal strains which are created from a mismatch of coefficients of thermal expansion (CTE) that occurs between two levels of packaging. As the package approaches smaller dimensions, measurements of thermal strains in the solder interconnections become very difficult. In this paper, moire interferometry technique was applied to evaluate the thermal strains in the second level interconnections for both conventional pin-in-hole (PIH) packages and surface mount components. The coefficient of thermal expansion of each component was measured. Thermal strain distributions in the solder interconnections were determined, and reliability issues were discussed. The strains in solder joints of the PIH components were much higher than those of the stacked surface mount components. Even though the surface mount components had a lower inherent strength, their overall mechanical reliability was much higher since they had practically no localized strain concentrations.

An Investigation of CO2 Laser Scleral Buckling Using Moiré Interferometry

2002 ◽  
Vol 33 (3) ◽  
pp. 221-227
Author(s):  
Saher M Maswadi ◽  
Peter E Dyer ◽  
Dinesh Verma ◽  
Wadah Jalabi ◽  
Dinesh Dave
Keyword(s):  
Co2 Laser ◽  
Scleral Buckling ◽  
Moiré Interferometry ◽  
Moire Interferometry
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